Molding-machine valve mechanism.



W. LEWIS.

MOLDING MACHINE VALVE MECHANISM.

APPLICATION FILED MAR.13. 1915.

1,157,406. Patnted 001}. 19, 1915.

. INVENTOR WITNESSES & 4w M BY 7 g 2 V ATTORNEY unrrnn sra'rias ra'rnn'r orricn.

WILFREID LEWIS, OF HAVERFORD, PENNSYLVANIA.

MOLDING-MACHINE VALVE MECHANISM.

To all to ham it'mag concern Be it known that I, lVILrRnn LEWIS, a citizen of the United States of America, residing in Haverford, in the county of Montgomery, State of Pennsylvania, have invented certain new and useful Improvements in lvIolding-ll fachine' Valve Mechanism,-of

Y which the following is atrueand exact description, reference being had to the acc'ornpa-nying drawings, which "form a part thereof.

My present invention consists in part in an improved valve mechanism especially adapted for use in a fluid pressure operated jar molding machine, and in part in the relative construction andarrangement' of the valve mechanism and the jar molding machine to which it is applied.

My invention comprises improvements over the apparatus disclosed and claimed in my prior application, Serial No. 849641,

filed July 8, 191a, devised with the purpose of making the valve mechanism simpler in 7 construction and of vgreater inherent rapidity and positiveness of operation, and with the further object of permitting a reduction in the unnecessary and undesirable clearance space in the fluid pressure operating mechanism of the jar-molding machine in Which my invention is employed.

The various features of novelty which characterize my invention are pointed out with particularity in the claims annexed to and forming a part of this specification. For a better understanding of my inven- -tion, however, and the advantages possessed 'by it, reference should be had to the accompanying drawings and descriptive matter in which I have illustrated and described two preferred embodiments of my invention.

Of the drawings: Figure 1 is an elevation partly in section of a molding machine equipped with a preferred form of myinvention; Fig.2 is a sectional elevation on a larger scale than Fig. 1, of a portion of the apparatus shown in Fig. l; and Fig. 3 is a section through one of the valve members the section being taken on the line 33 of Fig. 2.

The molding machine shown in Fig. 1 is of the so called shockless type, the stationary base A being formed with a cylinder space A receiving the vertically movable, spring supported floating anvil B, The latter is formed its upper end with a piston I B on' which cylinder Ufermed' on the un- Specification of Letters Patent.

Patented 19, 1915.

Application filed March 13, 1915. Serial No. 14,080.

der side of the mold support works. The

mold support is centrally apertured and recessed to provide a seat for the admission valve casing F. The upper end of the'aperture is closed,"and the valve casing F secured in place, by the head G detachably secured to the body of'the mold support. The head C is provided with a lubricator (J for supplying lubricating material't'o the valve mechanism working in the valve casing F. The anvil is recessed at B to receive the valvemechanism and provide the necessary clearance;

During the jarring operation the'chamber,

F in the casing F is continuouslysupplied with the working pressure fluid froma com'- pressed air supply tank or other fluid pressure supply source, as by means of the flexible pipe L and the valve L which may be a three-Way valve adapted to connect the chamber F either to the fluid pressure sup 7 ply'source or to the atmosphere. The passage of the pressure, fluid out of the chamber F through the port F to act between the piston B and the upper end of the cylinder C in lifting the mold support above cylinder connection between the mold support and anvil reduced to a practical minimum. 7 Above its valve seat engaging portion the valveGis formed with a cylindrical extension having a lower chamber G of large diameter and a coaxial upper chamber G ofsmaller diameter. As shown, the cham ber Gr is located Within a sleeve member G rigidly secured to the body of the valve member G. The chamber G is closed at its lower end except for a central opening receiving the plunger H which carries the main exhaust valve J at its, loWer end. The exhaust passage B communication between which and the chamber B is controlled by valve J, leads through the anvil B to the chamber A. I At the upper end of the plun ger H is a piston H working inthe chamber G and mounted on an intermediateportion of the'member H isa piston 1, working in the chamber G and movable relative to the member I between the plunger shoulder" H and the stop collar H In the construction illustrated the plunger H comprises a stem reduced at its upper end, -ghaving its reduced upper portion surrounded by the piston H and the depending tubular stem H 9, thereof, and by a sleeve member H Q on'which thepiston I actually works. The

V .sleeve'H and: plunger stem are rigidly r connected. ThepistonjH" andisleeve H are axially clamped between the stem shoul- Ider, H and the vnut 'H threaded-,andn

pinned to the upper end of the plunger stem. Thesleeve H is largerin diameter ,than. the unreduced portion of the plunger stem, and the tubular stem of the pistonH,

and its upper end formsa stop for the "stop 1 collar H which is slidingly mounted on the sleeve of the piston H and is normally held .againstthe sleeve H by the spring M act-v ing between the under side of pi'ston'H "and rtheflfl anged lower end of the sleeve..H

' A pin H? is employedto prevent rotative but not axialmovements of the piston I rel-f v sage H? is at all times in free communicaative to the plunger j The plunger H is formed passage H in its upper portion. ,The pas-w tion atitsupper end withthe inlet chamber'F, and communicates at its lower end through a lateral extension with the upa stopcollar H The lower end of anaxial 'fpass'age Hf formed in the lower portion of" the plunger H isin communication at all times with the exhaustpassage 13?, regard- '45 less of whether the valve J 'isseated or not Atits upper end the passage H communii cates with the lateral branch at the upper L end of the passage 1 when the piston I en- I gages the stop shoulder, H3, and communicates with the lower lateral branch I of the passage P'when the'piston I engages the V collar I The passage I is open tothe upper side 0f the piston I.

tothe upper end of the chamber G at the VVhen' the parts arein the position shown in Fig. 2, the upper end of the sleeve, portion G5 of thevalve member G engages an apertured stop plate or spider 0 The latter isnormally 'heldagainst the valve casing shoulder F beneathoit by the powerful spring" N. The purpose of the spring vpressed stop plateC istoprovide a stop for the upward movement of the valve nemwith an axial b er G in its casing which will yield to prevent the valve mechanism from being .crushedin case of 'a failure, or diminution in thickness of the usual bufler washer Z interposed between the striking surfaces of- "the mold support 'and anvil. Aeomparati'vely light spring L, acting" between the weaker than the spring N, acts between the valves G and J, andtends to hold 'them apart. As shown; the; lower. .end. of the spring I Q dire ctly engages the flange R attherlower end of at sleeve B-surrounding thestem of the plunger I-Iland' bearing against the valve J t-The upper end'of the a 7 spring Kactuallyengages the gland G I ofthe stuffing box employed to preventleakage ,along the I chamber G The parts are shown Fig. in the rela tive positions occupied when the mold sup-,

1 port isin its lowermost position relative to the anvil. In this condition the exhaust valve J is on its seat, and the inlet valve is held in its wide open position in which the valve ibody G' engages the abutment spider V C by the spring K gand by thedifierential effect-onthe valve mechanism of the exhaust f" pressure in the lower end of the chamber a G andof the supply pressure acting on both sides of the open port F, This dijfierential fluid pressure effect maintains the: valve member G in its wide open position during the initial, upward 'movement of the mold support. I

After a predetermined upward movement r of the mold support the piston I is engaged by the lower end wall of the chamber G and moved upward relatively to the member i H, until passages H andIt are incommuni v cation, and communication is established between passages I and H Since the cross sect onal area of'the' piston I is less than the cross sectional areaofthe annular space in i thev chamber G surrounding the lower stem portion of the plunger. H, as soonasair begins to flow through passages H and I into the lower end-of the chamber G while 7 at the-same time the space above the piston lower end of the chamber G? at the under sideQofthe piston Land passage I is open I is connected through passages I andH to The valve G naturally seats before the valve J opens. On"

the subsequent, falling movement of the mold support, the valve J first-seats, and then, as the downward movement of the mold support continues the valve member G opens, unclerthe tension of the springs Kand L andthe mcreasing pressure of the s i-t app d iii he c mb r 13?; i-Shmlfl 85 plunger Hinto or out of the;

these forces be msuflicient, as in case of the v of the inlet valve.

breakage or Omission of either or both the springs K and L, the positive engagement of the plunger H and valve member G, through sleeve R, will insure the opening At about the instant at which the valve Gr would begin to open r-connect passage I to- H and passage I to H so that the resultant upward fluid pressure on the valve member G due tothe low pressure prevailing inthe lower. end of chamber G assists in moving the valve-member G into its wide open position. A characteristic feature of this form of valve mechanism is the absence of dead centers. The pilot valve formed by the piston I shifts a head of the main valve mechanism and as soon'as. the piston I begins to connect one set of ports after disconnecting the other set, the resultant changein relative pressures in the opposite ends of the chamber G causes the'piston I to complete its movement relative to the plunger H, and the fluid pressures acting on it tend to hold the pilot valve I in either end position into which it maybe moved. The spring pressed stop collar H which arrests the upward movementof the piston I is provided to cushion the blow with which the piston engages the collar. While valves G and J operate in regular succession as explained above, their operation is so rapid as to be practically instantaneous.

The spring K when used insures the seat ing of the valve J at a. time when the cylinder chamber C is connected to the atmosphere, and the pressure in the chamber A is raised above atmospheric pressure in order to lift the floating anvil and its load for the purpose of compressing the mold, or in the case of a rock over machine for rocking over the mold. To permit the pressure in the chamber A to be adjusted for this purpose, a: valve L and suitable piping are employed for connecting the chamber A. either to the atmosphere, or 'toa source of pressure. I

\Vhile in accordance with the provisions of the statutes, I have illustrated and described the best forms of my invention now known to me, it will be apparent tothose skilled in the art that changes may be made in the forms of apparatus disclosed without departing from the spirit of my invention, and that under some conditions certain features of my invention may be used without a corresponding use of other features.

Having now described my'invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a ar molding machine having mold support and anvil members formed one with a cylinder space and the other with a piston working therein, said mold support being formed with a valve ,chamber and a -port opening therefrom into said cylinder space, the combination with said members of a valve controlling said port, and operating means for said valvelocated in said chamber.

In ar molding machine having mold support and anvil members formed one with a cylinder space and the other with a piston working therein, said mold support being formed with a. valve chamber and a port opening therefrominto said cylinder space, the combination with said members of an apertured inlet valve controlling said port, fluid pressure operating means for said valve including a pilot valve located in said chamchamber, the combination with said members,

of an inlet valve controlling said inlet port,

an exhaust valve comprising a stem portion passing into said valve chamber, and means located within the valve chamber for bringing about relative movements between said valves. I

4. In a jar molding machine having mold support and anvil members formed one with a cylinder space and. the other with a piston working therein, said mold support being formed with. a valve chamber and a port opening therefrom'into said cylinder space and said anvil being formed withan exhaust port leading away from said cylinder space, the combination with said members of an annular inlet valve controlling said inlet port and moving upward into said chamber to open the port, an exhaust valve controlling said exhaust port and comprising a stem portion passing through said annular inlet valve into said valve chamber, and means located within the valve chamber for bringing about relative movements between said valves.

In a jarmolding machine having mold support and anvil members formed one with a cylinder space and the other with a piston I working therein, said mold support being formed with a valve chamber and a port opening therefrom into said cylinder space and said anvil being formed with an exhaust assage leading away from said piston chamber, the combination with said members of an inlet valve controlling said inlet port and moving upward into said chamber her, and a stem passing through the aperturein said inlet valve and adapted to ento open the port, an exhaust valve compris- 1n g a stem portion passing through said an:

- 'nular inlet valve into said valve chamber, a piston and cylinder, connectlon-between said 7 valves. I e

, '6. In a jar molding machine having mold support and anvil members formed one-with a cylinder spaceiand the other with a piston working therein, said mold support being valves located within the valve chamber, a

pilot valve -mechanism i actuated by relative movements of said mold support andanvil to effect adjustments of said connectionand thereby bring about relative movements of approach and separation between said formed with a valve chamber and a port inletport and moving upward into said opening therefrom into said cylinder space and said anvil being formed with an exhaust passage leading away from said piston chamber, the combination with said members of an annular 1nlet valve'controlhng sald chamber'to open the port, an exhaust valve comprising a -hollow stem portlon passing through said annular 1nlet valve into said valve chamber, a piston and cylinder connec- .tion between said valves located Within the valve chamber, a pilot valve mechanism also located'in said 'chamber and actuated by relative movements of said mold support and anvil, to govern the admission to the interior of said connection of the exhaust pressure,

transmitted through said hollow stem, and

thepre ssure in said chamber to contract and expand said connection.

7. A Jar molding machlne hav1ng.mold

" support and anvil members'formed, one with a cylinder space and the other with a piston workingtherein, and: formed, one with a valve chamber and an inlet port opening therefrom to said cylinder space, and the 'otherw-ith an exhaust port leading away 7 from the cylinder space, and 111COII1lO1Ilf1l31OI1" therewith, an, inlet valve and an exhaust valve controlling sald inlet and exhaust ports respectively, 'a telescopic'connection between said valves comprising a cylinder 7 connected to one of said valves and a piston working therein, and having said mold sup-' 1 exhaust portcoaxial with said inlet port,

connected to the other of said valves but saving a limited movement relative thereto,

and ports communicating with the interior ofisaid cylinder and opened and closed by thev relative movement of the piston: and valve to which it is connected.

8. A jar molding machine having mold support and anvil members for'med one with a cylinder space and the other with a' piston port formed with a valve chamber, and an inlet port leading therefrom to said cylinder space, and havlng the anvil formed with an and in combinationtherewith, an inlet valve and anexhaust valve controlling said ports,

a ,PlStOIl and cylinder connection between end of said cylinder to exhaust and the other "tion therewith" a hollow inletvalve provided piston working in said extension and mount f reverse said connections.

valves, apilot' valve mechanism adjusted relative to saidmold support as the latter "approaches the limits of its movement rela-' tiveto the anvil, and adaptedjto connect one endto valve chamber in oneposition, and to reverse the connect ons another position sa dv pll0t"mechan1sm being 7 subjected tothe differential ofthe pressures in o the opposite ends of saidcylinder a-ndrim- "pelled thereby to continue'an adjustment started in either direction. i

9; A jar molding machine having I j-support-andanvil parts formed, one-with a V V cylinder space and theother with a piston, working, therein,"and' formed, one'witha valve chamber and an inlet port-opening therefrom to 'saidcylinder' spaceand the other with an exhaust port, and in combina- 5 With a cylinderextension'located within the valve chamber, an:exhaust valve-having stem projecting through said inlet valve intothe cylinder extension thereof, and a ed on, and adapted to-have a limitedaxial movement withrespect to said stem,".-'saidstem and piston being formed with ports adapted to connect ons end of said cylinder-g 'toexhaust and the other toflthe interior of' "the valve chamber-in one position of said working therein, and formed one'with a valve chamber and aninlet port-opening therefrom to said cylinder space, and the otheriwith an exhaust port, and in combinationtherewith'a hollow inlet valve provided with a cylinder extension located within the V valve" chamber, an exhaust valv'having a V stem projecting through said inlet valve into said cylinder extension thereof, apiston I mounted on said stem" and workingin said extension and axially movable with respect to saidstem, and-means restricting the relative axial movementof the stem and piston comprising'a resilient buffer restricting relative movement in one direction, saidrpiston Q and stembeing formedwith ports adapted .toconnect oneefnd of said cylinder to exhaust and the :other tothe interior of the 12 valvechamber in one position of said cylinder relative to said stem, and in anotherpo} sltion to reverse the cylinderjends connected Y to exhaust andvalvecham ber respectively, I ,e 11. A ar molding machme having mold support and janvil members formed, one with; a cylinder space and the other with piston workingtherein and having said mold support formed with a valve chamber and a portopenin'g therefrom to said spaceand 13),

iio

vanism controlling said ports and comprising a having said anvil formed with an exhaust l passage, and in combination therewith, a valve mechanism controlling said ports. and

comprising an inlet valve-and exhaust valve and a' telescopic connection between said valves, and a yielding abutment normally limiting the upwardmovement of said valve J mechanism relativeto said mold support.

12. A jar molding machine having mold support and anvil members formed,-one with ,a'cylinder space and the othervwith a piston working therein, and having said mold sup port formed with a valve chamber and an inlet port leading therefromto said cylinder space, and having the anvil formed with an exhaustport coaxial with saidinlet port, and in combination therewith',-a valve mecha hollow inlet valve, an exhaust valve havinga stem projecting upward through the inlet valve into said valve chamber, a piston and cylinder connection between said-valves,

0' working therein, and having said moldsupinlet port leading therefrom to said cylinder space, and having the anvil formed with an.

portformed with a, valve chamber and an exhaust port coaxialwith said inlet port, and f n-combination therewith, a valve mechanism controlling'said ports and comprisin'g ahollow inlet valve, an exhaust valve having a stem projecting upward through the inlet valve into said valve-chamber, a piston and cylinder connection between said' valves, a spring opposing the movement of said valve members into thelr positlon of closest ap- )roach a sarin actin between said inlet valve and the mold support tending to hold the inlet valve open, and a yielding abutment normally limiting the upward movement of said inlet valve relative to said mold support.

14. A jar molding machine having mold support and anvil members formed one with i a 'cylinderspace and the other with a piston Working therein, and having said mold support formed with a valve chamber, an inlet port leading therefrom to said cylinder space, and having'theanvil formed with an exhaust port coaxial with said inlet port,

and in combination therewith, a valve mechanism controlling the said ports and com prising a hollow inlet valve moving upward to open, an exhaust valve having a stem projecting upward through the inlet valve into said valve chamber, a piston and cylinder connection between said valves, a relatively weak spring acting between said mlet valve and the mold support tending to hold the inlet valve open, and a relatively strong spring normally limiting the upward movement of said inlet valve relative tosaid mold support. I V

WILFRED LEWIS.v

\Vitnesses: I I

ARNOLD KATZ,

D. STEWART.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. p 

